鉄と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
論文
高窒素オーステナイト系ステンレス鋼におけるMn添加による相変態機構の遷移
古賀 紀光福山 道紀中田 伸生土山 聡宏高木 節雄
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2014 年 100 巻 9 号 p. 1165-1171

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Fe-25Cr-1N-0, 2, 5Mn mass% alloys were subjected to isothermal heat treatment, and their microstructure formation and phase transformation behavior were investigated in order to clarify the effect of Mn addition on the transformation mechanism of high nitrogen austenite. Microstructure observation for the 1073 K heat-treated specimens revealed that the Fe-25Cr-1N alloy exhibited (α+Cr2N) lamellar eutectoid structure, while the Fe-25Cr-1N-2Mn and -5Mn alloys did finer (α’(or retained γ)+Cr2N) lamellar structure as well as (α+Cr2N) lamellar eutectoid structure. It was suggested that the (α’+Cr2N) lamellar structure had been formed through γ1→γ2+Cr2N cellular precipitation followed by martensitic transformation of γ2 on cooling to ambient temperature. Nitrogen concentration in untransformed austenite in the Fe-25Cr-1N-2Mn and -5Mn alloys was continuously decreased with progressing of (γ+Cr2N) cellular precipitation due to nitrogen long-range diffusion from untransformed austenite to (γ+Cr2N) cellular structure. As a result of decreased nitrogen concentration in untransformed austenite, transformation mechanism switched from (γ+Cr2N) cellular precipitation to (α+Cr2N) eutectoid transformation.

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© 2014 一般社団法人 日本鉄鋼協会

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